15mm OD. It's full of juice right now so I dont really want to dissemble for ID. Just in case you need the carto too, my SmokTech flanged DCT Carto is right on 9mm.
I just ran across the specs in another thread. 1/2" ID x 5/8" OD x 1/16" Wall x 36mm Length. Replacement polycarbonate tube can be bought on Amazon in those specs. The caps......much harder to come by.
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